<?php
/**
 * Embedding Orchestrator Service.
 *
 * @package AISupportAssistant\Embeddings
 */

namespace AISupportAssistant\Embeddings;

use AISupportAssistant\Admin\Settings;
use AISupportAssistant\Providers\EmbeddingProviderInterface;
use AISupportAssistant\Providers\WordPressAIProvider;
use AISupportAssistant\Providers\OpenAIProvider;
use AISupportAssistant\Providers\GeminiProvider;
use AISupportAssistant\Helpers\Logger;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Class EmbeddingService
 */
class EmbeddingService {

	/** Actual model used by the last successful embedding request. */
	public static string $last_model = '';

	/**
	 * Get the currently configured Embedding Provider instance.
	 *
	 * @return EmbeddingProviderInterface|null
	 */
	public static function get_provider(): ?EmbeddingProviderInterface {
		$settings = Settings::get_instance();
		$provider = $settings->get( 'ai_provider', 'wp_native_ai' );

		switch ( $provider ) {
			case 'wp_native_ai':
				return new WordPressAIProvider();
			case 'wp_connector_openai':
			case 'openai':
				return new OpenAIProvider();
			case 'wp_connector_gemini':
			case 'wp_connector_google':
			case 'wp_connector_google-gemini':
			case 'gemini':
				return new GeminiProvider();
			default:
				if ( WordPressAIProvider::is_available() ) {
					return new WordPressAIProvider();
				}
				return new GeminiProvider();
		}
	}

	/**
	 * Get the Vector Store instance (Native WordPress MySQL Vector Storage).
	 *
	 * @return VectorStoreInterface
	 */
	public static function get_vector_store(): VectorStoreInterface {
		return new MySQLVectorStore();
	}

	/**
	 * Retrieve embedding vector for a given text.
	 *
	 * @param string $text Content block.
	 * @return array Float vector array.
	 */
	public static function generate( string $text ): array {
		self::$last_model = '';
		$provider         = self::get_provider();
		if ( null === $provider ) {
			Logger::error( 'Could not resolve embedding provider.' );
			return array();
		}

		return $provider->get_embedding( $text );
	}
}